It is favorable for the increase of the adsorption film thickness by increasing the lyophobic chain.The determination of adsorption film thickness verifies the validity of the modification result.

• 木钠及改性木钠在疏水性和亲水性固体表面的吸附层厚度不同，其分子疏水链段的增加有利于增大其在疏水性（煤）表面的吸附厚度。